Diane Mackie Had Participants Listen to Groups of People Discussing

Diane Mackie had participants listen to groups of people discussing a topic. Some of the research participants thought that they would be joining the group in the future. Which of the following results did Mackie observe?

A) People estimated more extreme group norms but showed less attitude change toward those norms when they expected to join the group.
B) People estimated more extreme group norms and showed more attitude change toward those norms when they expected to join the group.
C) People estimated more extreme group norms and showed more attitude change toward those norms when they did not expect to join the group.
D) People estimated lower group norms and showed less attitude change toward those norms when they expected to join the group.